I came across a suggestion to a brightness issue on a different machine
that was fixed by setting GRUB_CMDLINE_LINUX="" to
GRUB_CMDLINE_LINUX="acpi_os_name="Microsoft Windows XP"". Apparently
fooling the bios into thinking its running Windows frees up more
facilities including control of brightness.
To make the adjustment to Grub, go to a terminal, sudo gedit
etc/default/grub will put the grub file into gedit, find the line and
edit it and save. Then in the terminal sudo update-grub.
Not yet tried it because I need more time in case I lose my screen
again! But someone else might want to.
Some more details of my set up below. (Note I currently have acpi off as
part of a different more complex fix and hope to be able to get it back
on to stop my laptop overheating and running the battery down in 10
minutes!)
ian@ian-HP-G62-Notebook-PC:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic
root=UUID=9ed9a092-9789-4941-adb9-7bfc021fc975 ro quiet splash text
acpi_osi=linux acpi=off vt.handoff=7
ian@ian-HP-G62-Notebook-PC:~$ ls /sys/class/backlight/*/
actual_brightness brightness max_brightness subsystem uevent
bl_power device power type
ian@ian-HP-G62-Notebook-PC:~$ sudo lspci -vnn | grep -A10 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company Device [103c:1439]
Flags: bus master, fast devsel, latency 0, IRQ 19
Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3050 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
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https://bugs.launchpad.net/bugs/873191
Title:
Ubuntu starts with lowest brightness on HP G62[regression]
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https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/873191/+subscriptions
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